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Finding the Fourth Proportional to 1,638.63, 2,261.25 and 892.58

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Solution

The fourth proportional to 1,638.63, 2,261.25 and 892.58 is: 1,231.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.63 : 2,261.25 = 892.58 : x
  2. Step 2: Convert to fraction form
    1,638.63/2,261.25 = 892.58/x
  3. Step 3: Cross multiply
    1,638.63x = 2,261.25 × 892.58
  4. Step 4: Simplify right side
    1,638.63x = 2,018,335.22
  5. Step 5: Solve for x
    x = 2,018,335.22/1,638.63
  6. Step 6: Final answer
    x = 1,231.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.